. >>> secretary of state hillary clinton is expected to testify wednesday, visit the house foreign committee next wednesday, she was supposed to testify last month before she suffered a blood clot. >>> over the years, coca-cola has called itself the real thing and said that coke adds life. now the company is responding to charges that coke and other soft drinks are shortening lives by making people fat. john blackstone reports on coke's new ad campaign. >> for over 125 years -- >> reporter: in a way there's a remarkable confession in the tv ads coca-cola started running last night. the soft drink giant admits its products are part of the obesity problem, but only part of it. >> all calories count, no matter where they come from including coca-cola and everything else with calories. >> the corporate say we're good guys, here to help not here to hurt anybody. >> reporter: ira kalb is a marketing prover at the university of southern california. >> they are trying to position themselves as part of the solution, and they are part of the solution. >> reporter: they make a sugary soft drink. >> it'